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I had an external HDD. It's USB connection socket along-with the microchip attached was damaged. I removed HDD case and found an Seagate Momentus 2.5" HDD. I then tried to use it as internal. It worked, but copying data into HDD is now very very slow. The copy speed has dropped significantly. I don't know why ? What can be the cause ?

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Copy speed depends highly on the filesystem used and the speed of the target Drive. If using windows, try hdtune.com/download.html and give us the results –  Kwaio Jul 30 '13 at 9:28
    
@Kwaio Done ! File Benchmark report added ! –  Code0987 Jul 30 '13 at 9:37
    
The first graph shows indeed strange behaviour...but i'm no expert. Hope someone more qualified can. –  Kwaio Jul 30 '13 at 9:42
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Although I cannot answer your question, I would HIGHLY recommend backing up all of your important data on the HD in case it fails or needs to be formatted. –  TheTurkey Jul 30 '13 at 9:50
    
I've kept data safe in another HDD. But all benchmarks are like above one, strange :( –  Code0987 Jul 30 '13 at 9:57

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